It seems the track hasn’t been too smooth for RailAmerica as it seeks to traverse the public markets.Shares of the North American railroad company, acquired by Fortress Investment Group in 2007, dropped Tuesday on their first day of public trading, The Associated Press reported.The Jacksonville, Fla.-based operator of short line and regional railroads in Canada and the U.S. set a price of $15 a share late Monday for the offering of 22 million of its shares. That raised $330 million before expens